This photo refers to our 220kV 2E10 SJ2 double circuit light angle tension tower, it is widely used in our Chinese market. Some of technical features of this tower as follow:1 climate condition

Item

Temperature (ºC)

Wind speed (m/s)

Ice thickness (mm)

Max. temperature

40

0

0

Mini. temperature

-20

0

0

Ice thickness

-5

10

15

Basic wind speed

-15

25

0

Installation condition

-10

10

0

Annual temperature

15

0

0

Lightning overvoltage

15

10

0

Operation overvoltage

15

15

0

Hot-line work

15

10

0

2 tower design data

Towertype

NominalHeight (mm)

NominalHeight (mm)

Horizontalspan(m)

VerticalSpan(m)

Angleº

InsulatorType

HorizontalSpan at angel condition

2E10 SJ2

30

450

600

450

0~20

/

/

Conductor type: 2×LGL-400/50

OPGW: JLB-150

3 Tower estimated weight and foundation force

TowerType

Tower weight scope (kg)

Foundation force scope (KN)

Tmax

Tx

Ty

Nmax

Nx

NY

2E10 SJ2

19304~26874

1094~1274

159~184

166~185

1448~1602

213~237

212~233

4Here is the design strength of Chinese tower steel

Steel material

Anti-push, bending and press strength (N/mm2)

Anti-shear strength (N/mm2)

Grade

Thickness or diameter (mm)

Q235Steel

≤16

215

125

>16~40

205

120

>40~60

200

115

>60~100

190

110

Q345Steel

≤16

310

180

>16~35

295

170

>35~50

265

155

>50~100

250

145

Q420Steel

≤16

380

220

>16~35

360

210

>35~50

340

195

>50~100

325

185

Q460Steel

≤16

415

240

>16~35

395

230

>35~50

380

220

>50~100

360

210

5 Here is the design strength of our Chinese tower bolts

Item

Grade

Anti-push strength (N/mm2)

Anti-shear strength (N/mm2)

Fastener for towers

4.8

200

170

5.8

240

210

6.8

300

240

8.8

400

300

Anchor bolts

Q235

160

/

Chinese 35 steel

190

/

Chinese 45 steel

215

/

Remark: above technical data only references for our client, we can design every type for our overseas clients.

MEGATRO is a full service engineering company with a global reputation for delivering excellence and innovation in power transmission, transformation, distribution, and telecommunications systems. Our MEGATRO provide and design this type 220kV 2E10 SJ2 double circuit light angle tension tower mainly for our Chinese and overseas client. Since 2004, MEGATRO focus mainly international market and had export many kind of transmission structures to overseas clients. MEGATRO has been manufacturing lattice transmission tower & tapered steel poles for lighting, traffic control, communication and utility applications. MEGATRO pioneered the development of transmission tower, telecom tower, substation, and other steel structure and was also at the forefront in the design of Transmission tower.

Over 10 years of experience and innovation in engineering, designing and building towers has evolved MEGATRO into its current form:

Today, with over 10 years of experience and our commitment to excellence, MEGATRO remains an industry leader in the manufacture and design of steel tubular & angular & monopole structures for all Highway, Municipal, Custom, telecom, lighting and electric Utility applications. MEGATRO has a complete staff of professional engineering personnel trained in the PLS Pole program and three different manufacturing processes for producing steel towers, poles and other supports. We utilize the latest versions of PLS-CADD, PLS-POLE, TOWER, AutoCAD and other CAD software.

The structure shall be designed according to load combinations given as per IEC 61936-1 and as illustrated below:Normal loads1 Dead weight load2 Tension load3 Erection load4 wind load

MEGATRO performs in-house design activities specializing in electrical overhead transmission &telecom tower steel works, which include wind and earthquake loading, static analysis, stress analysis by finite element methods and fatigue. Our Engineering Department is boasting of highly qualified engineering who are conversant with international codes and standards. The work is carried out with extensive use of CAE/CAD via a large of computer network. The computer hardware & drafting software are liked to the CNC workshop equipment for downloading of information thereby eliminating error and saving valuable production time.

Besides, MEGATRO is one of the few manufactures who assemble a face of 220kV 2E10 SJ2 double circuit light angle tension tower. This attention to quality may not be the cheapest process but it does insure every tower meets our high standards of quality. And it helps to reduce on-site construction cost due to mismatched assemblies. After fabrication all 220kV 2E10 SJ2 double circuit light angle tension tower are delivered to the galvanizing facility to be Hot DIP Galvanized. Towers are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free towers. All finished surfaces shall be level and free of tears, burrs, clots and impurities.

Other information:Availability size: Based on the customer's requirements.Material: Chinese material or as per clients requirementSteel gradesTower legs: Chinese steel Q345B, which equivalent to ASTM A572 GR50Other webs, bracing and not stress plate and angle steel: Chinese Q235B, which equivalent to ASTM A36Plates: Chinese steel Q345B, which equivalent to ASTM A572 GR50Bolts: Bolt quality shall be Chinese Class 6.8 and 8.8, as per our Chinese standard, or ISO 898 standard or ASTM A394 type 0,1,2,3 requirementsThe anti-theft bolts shall be Huckbolt Fasteners or approved equivalent. The fasteners shall be manufactured from high tensile steel A242 or equivalent and hot-dip galvanized in accordance with ASTM specification A153 and A394.

Fabrication standard: Chinese Standard or other standard which client acceptedA) Dimension and tolerance for angle are according to GB/T1591-1994, similar to EN 10056-1/2B) Hot dip galvanization in accordance with GB/T 13912-2002, which similar to ASTM A 123C) The welding will be performance in accordance with AWS D1.1 or CWB standardD) All fastener galvanization conform to ASTM A153 requirements.

Package: Both parties discuss before deliveryPort of Loading: Qingdao PortLead Time: One month or based on the customer's needs (For time being our capacity about 5000 tons one month, and can meet client requirements)Minimum order: 1 set

General Fabrication RequirementsHere is general fabrication requirements for our transmission tower; however, both parties must discuss all drawings and confirm all shop drawings, technical specification, and which standard to conform. Before mass production, we must received all signed approved shop drawings and technical documents from our client.

Our Fabrication shall be in strict accordance with detail Drawings prepared by the Contractor and approved by the Engineer. Fabrication shall begin after the approval of the shop assembly and tests.

ShearingShearing and cutting shall be performed carefully and all portions of the work which will be exposed to view after completion shall be finished neatly. Manually guided cutting torches shall not be used.

All material over 13 (or 12) mm thick shall be cold sawn or machine flame cut.Cropping or shearing shall be allowed for material thickness of 13 mm or less.Flame cutting of high yield steel shall be preceded by a slight preheat operation by passing the cutting flame over the part to be cut.All flame-cut edges shall be ground clean.

BendingBending shall be carried out in such a manner as to avoid indentation and surface damage. All bending over 5o, or high yield steel, shall be performed while the material is hot.

Welding No welding shall be done unless prior approval has been obtained from the Engineer.Welding shall not be allowed at tower attachment points for conductor, shield-wire, insulators or associated assemblies or brackets.

Sub-punchingAll holes in structural steel less than 10 mm thickness may be punched to full size unless otherwise noted on the approved Drawings. Holes shown on the Drawings as drilled holes and all holes in structural steel 10 mm or more in thickness and tension members of cross-arms shall be drilled or sub-punched and reamed.

All holes shall be clean cut and without torn or ragged edges. All burrs resulting from reaming or drilling shall be removed. All holes shall be cylindrical and perpendicular to the member.

Where necessary to avoid distortion of the holes, holes close to the points of bends shall be made after bending.

PunchingFor punching to full size, the diameter of the punch shall be 1.0 mm larger than the nominal diameter of the bolt, and the diameter of the die shall not be more than 1.5mm larger than the diameter of the punch. For sub-punching, the diameter of the punch shall be 4 mm smaller than the nominal diameter of the bolt, and the diameter of the die shall be not more than 2 mm larger than the diameter of the punch. Sub-punching for reamed work shall be such that after reaming no punch surface shall appear in the periphery of the hole.

Hole SizeWhere holes are reamed or drilled, the diameter of the finished hole shall be not greater than the nominal diameter of the bolt plus 1.0 mm.

AccuracyAll holes shall be spaced accurately in accordance with the Drawings and shall be located on the gauge lines.The maximum allowable variation in hole spacing from that indicated on the Drawings for all bolt holes shall be 0.8 mm.

Fabrication TolerancesA specification for tolerances shall be submitted for approval by the Engineer prior to commencement of fabrication.

Bolt ListA complete list of bolts showing their lengths and the members, which they are to connect shall be given on the erection diagrams.

Step bolt:Each steel tower shall be provided with step bolts on one of the legs for single circuit steel tower and on two diagonally opposite legs for double circuit steel tower from approximately 2.5 meters above ground level to the cross arm and from thereon to each ground wire peak. Step bolts shall be furnished for each leg extension in an amount of 25% of the step bolt holes. These bolts shall not be less than 16 mm or 3/4" diameter, double nut type, 18 cm or 7" long with 35 mm or 1 5/8"diameter, symmetrical head, two hexagon nuts and spring washers, spaced not more than 45 cm or 18" apart. Each bolt shall withstand without permanent deformation a vertical load of at least 137 kg applied at the bolt head. If any technical specification, we will discuss with our client and confirm before mass production.

Locking DevicesLocking devices for tower bolts will not be required, but point punching shall be performed.

Anti-theft FastenersAppropriate anti-theft fasteners for example Huck-bolting shall be applied on all the towers up to the level of anti-climbing devices, to prevent theft of tower members.

Piece MarksAll pieces shall be stamped before galvanizing with the piece marks shown on the erection Drawings, with the marking not less than 20 mm high placed in the same relative location on all pieces. The marking shall be plainly visible after galvanizing.

GalvanizingAll material shall be hot-dip galvanized after fabrication in accordance with the latest revision of GB/T 13912-2002 or ASTM Specification A 123.

Material that has been rejected because of bare spots or other coating defects shall either be stripped and re-galvanized, or the uncoated areas shall be recoated by an approved method.

All plates and shapes which have been warped by the galvanizing process shall be straightened by being re-rolled or pressed. The material shall not be hammered or otherwise straightened in a manner that will injure the protective coating.

Approval shall be secured from the Engineer if galvanizing is done outside of the Contractor's plant.

All galvanized steelwork shall be protected against white storage stain by using an approved dichromate solution treatment immediately following galvanizing.

Shop Assembly and InspectionAll built-up assemblies shall be shop bolted complete with washers, after galvanizing, and shipped as a unit. When specified in the Purchase Order, MEGATRO shall completely assemble in the presence of Owner one (1) structure of each type before the first shipment of such structures. Any errors in the shop detail drawings or shop work shown by this assembly shall be immediately corrected. MEGATRO's proposal shall include the work required for these shop assemblies. Any material rejected by Owner for failure to conform with this specification or the Purchase Order shall be corrected or replaced by MEGATRO. The fact that material has been inspected, or Owner has waived the right to inspect any material, shall not prevent rejection of the material if it is found not to be in proper condition o r to have fabrication inaccuracies preventing proper assembly.

Design Calculations and DrawingsOur MEGATRO can perform complete design calculations, design drawings and shop detail drawings of each structure and submit checked calculations and drawings for Owner's review and distribution in the quantity, manner and time set forth in the Purchase Order. Our drawings consist of the following:

Erection drawings showing each individual member with its identification mark, location and position of outstanding leg of angles, with number, diameter and length of bolts for connection; and typical details to large scale where a number of members frame together.

A complete Bill of Material for each structure showing the number, kind, size, length, weight and identification mark for each member including all bolts.(Remark: only PO confirmed, our MEGATRO can start shop drawings for client.)

MarkingAll pieces shall be distinctively marked with erection marks clearly visible after galvanizing, corresponding to those on the erection drawings. Steel tower steel stamping dies, minimum 16 mm or 5/8" high, shall be used and special care shall be taken to see that all erection marks are made in such a manner as not to be obliterated in transit, or in any way damage the galvanizing or impair the strength of the member.

In marking the members, each marking shall be prefixed by letters, which indicate the type of the steel tower. For members that are used in more than one type of steel tower, all steel tower-type designations shall appear on the marking.

In addition, the members shall be marked with water -proof ink stencil 25 mm. or 1.0" high after galvanizing to facilitate in yarding the members and erecting the steel towers.

The diameter and the length of the bolt shall be marked on each bolt end so as to be visible after galvanizing.

An additional Contractor identification mark shall be stamped immediately in front of the piece identification marks. This Contractor identification mark shall be submitted to Owner for acceptance and registration prior to first use.

Identification marks shall be located conspicuously to permit easy reading. Marking of like pieces shall be identical in location, and pieces over 14 feet in length shall be marked at both ends.

Identification marks shall be applied as follows:Before galvanizing stamp with 2.0mm deep, 15.0mm minimum height steel die letters and numerals. After galvanizing neatly stencil a 6.0mm wide straight line, to underline the identification marks, made with durable paint or ink that will adhere to the galvanized surface and remain legible.

All small items that are not adaptable to die marking and are not boxed shall be identified by either attaching die stamped steel tags or plastic tags with permanent markings. The tags shall be attached with non-corrosive wire.

Preparation for Shipping and StorageTo facilitate segregation of steel tower parts at the stockyard and to maximize the efficiency of erection, packaging of steel towers shall be as follows:All steel tower parts, including stub angles, plates and steel tower parts member shall be color coded. The color code shall be painted on both ends of the steel tower parts for all angular members and around the edges for plates. The color codes shall be as specified in the Technical Data Sheets. All stub angles shall be packaged per unit steel tower per type i.e., four (4) pieces per bundle.

All cleats including bolts and nuts with spring washers for stub angles shall be packaged per unit steel tower per type in wooden boxes with corresponding color code painted on all corners of the box.

All basic body steel towers shall be packaged per unit steel tower per type. Each package shall not exceed three (3) metric tons. The contents of each package per unit steel tower per type shall be identical for any succeeding unit type. The numbering of each package shall indicate steel tower type (basic), steel tower number and number of pieces included in the package.

All bolts and nuts with spring washers shall be package in tin cans or wooden boxes per unit steel tower per type and numbered as follows:Example:MG Bolts (Basic)/Steel tower No./Package No./Quantity

All plates and gussets for the basic steel tower shall be package in wooden boxes per unit steel tower per type and numbered as follows: Example:MG Plates (Basic)/Steel tower No./Package No./Quantity

All body extension steel tower parts shall be package per unit steel tower per type. The weight of each package shall not be more than three (3) metric tons. The contents of each package per unit per steel tower shall be identical for any succeeding unit steel tower. The numbering of each package shall indicate the steel tower type and extension steel tower number, and number of pieces included in the package.

All steel tower parts/members shall be marked as indicated in the steel tower parts list. The markings shall be embossed, the size of which will be approved by the our client.

All package numbers for the steel tower shall be in label form. The size of the label shall be 5 cm x 10 cm. The label shall be waterproof and all letterings on the label shall be printed. This label shall be attached on every bundle of package. Each bundle or package shall have at least two (2) labels, each label is visible on each side of the bundle.

All bundle or packages for steel tower shall be properly strapped to avoid disintegration of the bundle when subjected to unnecessary impact. The strap shall be properly placed so that the breakage of one (1) or two (2) straps will not allow disintegration of the bundle or package.

Smaller pieces shall be bundled, with all the pieces in any bundle having the same mark.

All small pieces such as bolts and connections for ground wire and insulators shall be packed in boxes of not over 70 kg gross weight each. Bolts of different size or length shall be wrapped in separate sacks before boxing. Description, quantity, bolt size, and length shall be clearly marked on the outside of the sacks and boxes.

When specified in the Purchase Order, bundling and packaging shall be in lots for each individual structure. Boxes or other containers shall be clearly marked to indicate the type of steel tower for which the enclosed material is intended, and the quantity and marks or description of contents shall be shown on the outside.

Shipping shall be as specified by the Purchase Order and shall be in complete steel tower lots. All identifications shown on bundles, boxes or other containers shall be included on Contractor's shipping and packaging lists.